William perkins



I gotten gutter, figment 3 a WIILLIAM PERKINS, or RUSSELL PLACE, FITZROY SQUARE, AND GEORGE GRAINGER TANDY,

OF ANERLY ROAD, HAMLET 0F PENGE, ENGLAND. i

Letters Pateizt 1Y0. 78 ,125, datedMafg 19, 1868.

Bilge fiflgtbuls were in in 1132s: 3mm Etatmttut tinting part at the time.

TO ALL, WHOM IT MAYVGONCERN:

Be it known that we,- WI-LLIA uPEimIxS, of Russell Place, Fitzroy -Squarc,-in the county of 'Middlesex,

chemist, and GEQRGE GRAINGER TANDY, of Anerly Road, in the Hamlet of Pengefin the county of Surrey, gentleman, have invented an Improved Preparation or, Compound Applicable for Insulating Electric-Conductors,

t ian d forsuch purposes as India rubber and 'other'vulcauizahle' gums arc applicablepz' and 'w c do hereby declare that the following is'a. full and exact description of our said invention. l

V This inve'ntionhas for one of its objects the production of an insulating 'compound, applicable for covering telgraphiectibles and electric conductors. The compound is also applicable for the various purposes for which Indiarubber or gutta-percha compounds have been heretofore employed, orfor which such substancesmay be used.

Our improved compound is produced by the combination of anthraeene(or para-naphthaline) and naphthalene, and compounds thereof, with vulcanizable substances, such as India rubber, gotta perchalgum-hallata, and other analogous guinuaud sulphur. The solid-hydrocarbons abovereferredito, (anthracene and napht atlen'e ,)"are obtained amongst thelast products derived from the distillation of coal-tar, the tar produced in the -Londongas-works being particularly rich in such hydrocarbons,

In order to. mix or combine the above substanccswitli each other, any of the well-known and understood processesfor mixingv or combining sulphur with such gums may be employed, but we prefer to make use of heated,

rollerslfor the purpose; I

The proportions in which these substances are to he mixedzwill vary according to the quality of gum employed, and, whether a soft, hard, or tough compound be required. For instance, in using India rubber, it is found that the qualities of this substance vary so much that in order. li0-'pl 0(l.1100 one uniform quality of compound, considerable care must be taken, not only as to the proportions, of thenaphthalenc or anthrac'euc to be employed, but also" as t'o'the quantity of sulphur to be used in the jcompound.

In order to produce an insulating-compound for'covering telegraph-wires oi electricconductors, we find that a combination of fifty parts by weight of sulphurcd rubber, gutta pcrcha, gum-ballzita, or other vulcanizablc gums, with fifty parts of naphthalene or'anthracenc, forms an excellent insulator, and possesses grcatadvant'ogcs over gutta pereha and vulcanite of thezordinary manufacture, as porosity in the compound is obviated.

In order to produce our improved compound, we find it advisablefirst to combine the'sulphjur with the fair her, by passingthe rubber and sulphur betwcen'rollers, or'by mastication. in t or in ry Winner, and to add to thesulph u rcd rubber the desired proportion of anthracenc and naphthalene, which )vill bc combined with the other materials by passing them between the rollers, as whcnm ixing the sulphur with the rubber. In some cases, however, we add the anthracene and naphthalene, together with the sulphur, to the rubber or other gum,

and we then proceed to incorporate all the ingredients, by'meansof masticating or grinding-rollers,jas when incorporating sulphur alone with the rubber in thclordinary manner. Any of the known solvents, such as bisulphide of carbon, petroleum-spirit, or coal-tar naphtha may also be employed in combining the naphthalene or anthracene with the vuleanizahlogums. Whenlthe ingredients have all been properly incorporated and inti 'mately'mixed,the mass maycither be rollcd out into sheets, as'in the ordinary'inanufacture of sheetrubber, and then out up into strips of suitable width for winding around 01 otherwise covering the wires, orthe com pound maybe made up into any otherform, aecording'to the purpose for which it is to be employed] In applying the compound to telegraph-wires or electric conductors, for the purpose of insulating them, we do not confine ourselves to any particular method, as it may be put on either iii-longitudinal stripsor wound helically aroundthe wires, or the insulating-compound may be applied in a plastic state to the electric conductor Vor cahle.- i

vAfter the wires'have been covered, the change (or curing) of the compoundis to be cfi'ected in any of the ordinary ways, viz, by means oflsnperhea-ted steam, by hot air, or by heating thc co'v'ercdwircs in an oven, all of which processes are well knowp, i i i i sixty-eight. v

I The proportiensof naphthalene and anthracene to be employed maj be varied from ten to seuent'yfivo' per:

cent; and the quantity'vo f sulphur may vary from 'ten to forty percent according to the hardness or toughness required in the cou'ipou'nd. I e I Our impror'ed compound may be empioyed-for any of the purposes to which India rubber, gutta perchu, gum-ballata and othe'rvanalogous substaneegare applicable, such' as for producingwater-proof fabrics, elastie' hose'and tubing, the manufacture of-boots angfshoes; and various other purposes, too numerous to mention.

Having now described .our invention of unimproved preparation o r'co'inpound, applicable for insulating electric eonduetore, and for such purposes as India rubber or other vulcsnizable gums are applicable,"-und having explained the manner of carrying the same into ell'ect- I We claim, as our invention; the combination of an thi'acene orpuramaphthalineand naphthalene, with India rubber, gutta percha, gu'm-ballata, and other analogous ,vulcanizable substances, and sulphur, for the purpose of producing a preparation or compound applicable .to the uses or purposes abovementioned, oi: any analogous purgoses. M I J I :In witness whereof, we, the wewmmm Puuxms and Gunman Gunman T mur, have hereunto set our hands and seals, the seventeenth day-of March, in the year of our L'orrl one thousantljeight hundred and PERKINS. I 1. 8.

GEORGE GRAINGER TANDY- [L 3.]

7 Witnesses 1' i FREIL. WALKER, 66 Chancery Lane; Londonw M. WYNN, 24 RbyaZ-Eachdnge, London. 

